(WIP) Support tlsrestrictnsssync.

Tested and working; still need to run static analysis.

backend/backend.go

@@ -7,6 +7,7 @@ import "github.com/namecoin/ncdns/namecoin"
 import "github.com/namecoin/ncdns/util"
 import "github.com/namecoin/ncdns/ncdomain"
 import "github.com/namecoin/ncdns/tlshook"
+import "github.com/namecoin/tlsrestrictnss/tlsrestrictnsssync"
 import "github.com/hlandau/xlog"
 import "sync"
 import "fmt"
@@ -107,6 +108,11 @@ func convertEmail(email string) (string, error) {
 // Do low-level queries against an abstract zone file. This is the per-query
 // entrypoint from madns.
 func (b *Backend) Lookup(qname string) (rrs []dns.RR, err error) {
+	if !tlsrestrictnsssync.IsReady() {
+		err = fmt.Errorf("tlsrestrictnss not ready")
+		return
+	}
+
 	btx := &btx{}
 	btx.b = b
 	btx.qname = qname

server/server.go

@@ -15,6 +15,7 @@ import (
 	"github.com/namecoin/ncdns/backend"
 	"github.com/namecoin/ncdns/namecoin"
 	"github.com/namecoin/ncdns/tlsoverridefirefox/tlsoverridefirefoxsync"
+	"github.com/namecoin/tlsrestrictnss/tlsrestrictnsssync"
 	"gopkg.in/hlandau/madns.v1"
 )
 
@@ -220,6 +221,11 @@ func (s *Server) Start() error {
 		return fmt.Errorf("Couldn't start Firefox override sync: %s", err)
 	}
 
+	err = tlsrestrictnsssync.Start()
+	if err != nil {
+		return fmt.Errorf("Couldn't start tlsrestrictnss sync: %s", err)
+	}
+
 	return nil
 }